Watch more Belly Dancing 101 videos: Let belly dancer Irina Akulenko teach you how to do belly dance undulations in this Howcast video. So now let's try the basic undulation. Keeping the knees bent, lower abs engaged, we're gonna slide the chest all the way forward. Lift it back up. Contract the upper abs to drop the chest down and then contract the lower abs to bring the hips under. And then untuck. But make sure that when
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